Is there a way to change a char sprite? All the sprites but the merc sprite looks nice. So I would like to change it if possible.

If you have the sprite skills, anyone can change any sprite in the game but only you will be able to see the changes (or people you share the new sprites with).

If the sprites are good enough and deemed worthy by the community they can be added to the game sprite pack for everyone to use.

If you are a skilled sprite maker then you can suggest new sprites to be added as new items in the game.
Some nice builder may then incorporate the new sprites into a new development in future.

Ok thank you. I dont know how to build sprites. I actually just got into self teaching myself how to do computer programming. Learning a little html css and javascript.

My sprite making skills are rudimentary and that is probably being complimentary.
Sigh.

Atleast you know how to do it. I dont even know what programs to run to code or manage that.